Bathtub



FIG. 1 is a top and left and front perspective view of a bathtub;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a top and right and rear perspective view thereof.

All broken lines illustrate portions of the bathtub to which the design is applied that form no part of the claim. 

CLAIM I claim the ornamental design for a bathtub, as shown and described. 